%I #13 Mar 21 2018 18:16:16

%S 0,1,3,7,9,11,25,33,41,121,127,133,139,147,153,159,165,173,179,185,

%T 191,721,751,781,811,843,873,903,933,965,995,1025,1055,5041,5065,5089,

%U 5113,5137,5167,5191,5215,5239,5263,5293,5317,5341,5365,5389,5419,5443,5467

%N Palindromes in factorial base.

%C Equivalently numbers n such that row n of A108731 is symmetric. - _Rémy Sigrist_, Mar 20 2018

%H Rémy Sigrist, <a href="/A046807/b046807.txt">Table of n, a(n) for n = 1..1000</a>

%H <a href="/index/Fa#facbase">Index entries for sequences related to factorial base representation</a>

%H <a href="/index/Pac#palindromes">Index entries for sequences related to palindromes</a>

%e 41 = 1 4! + 2 3! + 2 2! + 1 1!.

%o (PARI) is(n) = my (d=[]); for (r=2, oo, if (n==0, return (Vecrev(d)==d), d=concat(n%r, d); n\=r)) \\ _Rémy Sigrist_, Mar 19 2018

%Y Cf. A108731.

%K base,nonn

%O 1,3

%A _Erich Friedman_

%E More terms from _Floor van Lamoen_, Oct 31 2001

%E Data corrected and initial 0 added by _Rémy Sigrist_, Mar 19 2018